Browsing by Author "Dafinov Ivanov, Anton Ivanov"

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Catalytic palladium-based and iron-based membrane reactors: novel strategies of synthesis
(2019) Pinos Vélez, Verónica Patricia; Di luca, Carla; Crivoi, Dana; Medina, Francisco; Dafinov Ivanov, Anton Ivanov
Several procedures were employed in the preparation of diﬀerent Pd- and Fe-based catalytic membrane reactors (CMRs) via the normal wet impregnation method, reverse ﬁltration of a microemulsion, sputtering method, and the precipitation of a Fe complex. Depending on the chosen procedure, the metal active phase can be found on the exterior and/or interior part of the CMR or even in its pores in concentrations between 0.05 and 2 wt %. Moreover, we have managed to implement a unique systematic process to grow hydrotalcite in the pores of a Pd-CMR. To exemplify the activity of these new CMRs, we have tested them in the peroxidation of phenol and in situ epoxidation of trans-chalcone.
Performance of the catalytic membrane reactors of different pore size with palladium as catalytic phase in hydrogenation and oxidation reactions
(2018) Pinos Vélez, Verónica Patricia; Medina Cabello, Francesc; Dafinov Ivanov, Anton Ivanov
The catalytic membrane reactors (CMR) were prepared using a commercial Hollow Fiber Membrane of corundum of 4 and 1400 nm and impregnated palladium. The tests performed were phenol hydrogenation, hydrogen peroxide generation to oxidize phenol by advanced oxidation processes and chromium (VI) reduction. Reactions were performed in aqueous solution, mild temperature and atmospheric pressure. For all tests, the hydrogen passed through the membrane to be activated with palladium. The test with phenol showed that in absence of oxygen, the activate hydrogen reacts with the organic matter leading to the formation of hydrogenated products; while, in the presence of oxygen, active hydrogen reacts with the oxygen to form hydrogen peroxide and subsequently hydroxyl radicals that attack the organic matter until its mineralization. Furthermore, the CMR is capable of reducing chromium VI to chromium III. The CMRs of less pore size present better performance in all reactions.